Efficient cloud storage copy proving method and system supporting public verification and application thereof

Abstract

The invention belongs to the technical field of cloud storage security, and discloses an efficient cloud storage copy proving method and system supporting public verification and an application thereof, and the method comprises the steps: generating a corresponding copy packaging key according to a key generation protocol; according to an IAE packaging algorithm, generating a corresponding copy; and recovering a corresponding file according to an IAE decapsulation algorithm. Under a random oracle model, the condition that an existing encrypted storage scheme (namely, a PR1-POREP scheme) is not safe to the selected message attack can proved, and the condition that the muPR1-POREP is safe to the whole opponent which can initiate the selected message attack in the random oracle model. Compared with the existing scheme (PRI-POREP), the copy coding algorithm provided by the invention has the advantages that the packaging can be completed by only one round of multi-round coding, and the coding efficiency of the copy is greatly improved. In addition, the present invention shows how to extend the system of the present invention to support efficient dynamic updates, i.e., block-level file updates.

Description

technical field [0001] The invention belongs to the technical field of cloud storage security, and in particular relates to an efficient cloud storage copy proof method, system and application supporting public verification. Background technique [0002] Present: Cloud storage services offer individuals and businesses a cost-effective, high service availability, and on-demand scaling alternative to outsourcing data without costly upfront investments. However, the potential for dishonest storage service providers, internal / external attackers, and many other malicious actions makes outsourcing files a serious security risk. Among them, secure proof of storage is a key aspect. Over the past decade, various proof-of-storage solutions have been devised to meet customer needs to verify the integrity / retrievability of outsourced data, such as Provable Data Possession (PDP) [Ateniese, et al.: Provable data possession at untrusted stores, CCS 2007.] and Proof of Retrievability (POR...

AI Technical Summary

Problems solved by technology

[0004] (1) In the existing copy storage proof scheme PRI-POREP, there is a chosen message attack

[0005] (2) In the existing copy storage proof scheme PRI-POREP, the practicability is poor, and the calculation overhead of storing the copy is huge. For example, if it is assumed that the complete exponentiation operation of a 1024-bit RSA module takes 1 millisecond, then provided in 1MB The RSA decryption operation on the file takes about 8.2 seconds

So it takes the client about 2.18 years to make a copy of a 1MB file, which is very inefficient for a practical cloud storage system

[0006] (3) In the existing copy storage proof scheme PRI-POREP, efficient dynamic updates are not supported, and to update files, all copies need to be downloaded

Therefore, the computational cost is proportional to the file size and the number of copies, and the overhead is large

Images